Basement Subfloor Error?

So I started laying the subfloor down in my basement, when it dawned on me that I didn't leave an expansion gap around the perimeter of the room.. I already have the subfloor screwed down with tapcons also... Here is a picture:

What do you guys suggest I do?? Think I'll be OK without the expansion gap, as it's in the basement, and should stay relatively one temperature all the time.. Or should I somehow shorten the subfloor up?